Control for use with a wiper motor



March 17, 1959 F. A. KROHM R CONTROL FOR USE WITH A WIPER MOTOR FiledOct. 11, 1954 3 Sheets-Sheet 1 FRED A. KROHM mjy ATTOR EY March 17, 1959F. A. KROHM 2,877,659I- CONTROL FOR usa: WITH A WIPER MOTOR Filed Oct.11, 1954 3 Sheets-Sheet 2 INVENTOR. FEED A. [leaf/M BY WM@ ATTO NEY lMarch 17, 1959 F. A. KRoHM 2,877,659

CONTROL FOR USE! WITH A WIPER MOTOR Filed Oct. 11, 1954 3 Sheets-Sheet 3JNV'ENTOR.

` F/EED A. f/aoHM ATTORNEY f .Uid States Patent 2,877,659 -C'oNTRoL FORUSE WITH A WIPER MoToR Fred A. Krollni, Hobart, Ind., assigner,

ments, to The Anderson Company, Indiana by mesne assigna corporation of1949, serial No. 100,445,

dated December 19, 1954. application October 11, 1954, Serial Thisinvention relates generally to stroke adjusting means for oscillatorypower units, and more particularly,` has to do with a windshield wipermotor of the fluid type. This application is a division of my copendingapplical non Serial No. 100,445 tiled June 21, 1949 (now Patent No.2,696,805).

This application is also a co-ntinuation in part ofapf pllcations SerialNo. 83,896, tiled March 28, 1949, and Serial No. 92,634, led May 1l,1949;

A purpose of the subject invention is to greatly reduce the number ofmotors required to be carried in retail and wholesale replacementinventories, so as to encourage and enable a much larger number ofwholesalers and re-l tallers to provide such service, to the end thatdriving and walking on the streets and highways will-becomelesshazardous.

Another object of the invention is to provide a driver member 93, asillustrated in Figure 4, said member having lugs 95 and 96 projectingthrough a guide plate and constructed and arranged to contact and urgeforward inner portions of the internal cam member so -that the over-al1degree of arcuate movement of the windshield wiper arm may be varied tosuit varying requirements of different motor vehicles. By this yuniquemethod and structure, a still further obstructionl to universality ofdesign and application of replacement windshield wiper motors of thevacuum type is substantially eliminated. It will be noted that thedriver member, as shown in Figure S, may be shifted and adjustedby amanual control ele-y ment 203 preferably operating in conjunction withan eccentric.

A particular object of the invention is to provide a manual `control onthe motor, independent of the liexible control unit on the instrumentpanel, so that the iotational range of the motor shaft and the vane orpiston may be varied and predetermined to meet different installationrequirements. y

A signicant object of the invention is to provide a novel cover for thesecondary valve operating'mecha nism, the cover serving a plurality ofuses.

Gtherobjects and advantages of the inventipn will become apparent afterthe description hereinafter set forth is considered in conjunction withthe drawings anneined hereto. .l

Referring to the drawings, wherein like parts are desig nated by thesame numerals,

Figure 1 is a sectional viewl of the inotorassemljly, showing the meansfor shifting the stroke adjusting means from outside of cover 9 8;

Figure 2 is a face View of the motor with thefcover forthe snapvalvemechanism removed;

Figure 3 i M the actuator therefor and stroke adjusting element removed;

Figure 4 is an explodedviewof parts of the secondary ylve niechnismant'm tial ccintrel the'r'ercjr;

. intervals.

is a view ofthe snap valve mechanism with Figure 5 is an exploded Viewof those parts of the 2,877,659 Patented Mar. 17, 1959 ICC Figure 7 is avertical section taken through Figure 6,

exernplitying details of construction;

y Figure 8 is a front view, similar to Figure 6, illustrating differentpositions of certain parts;

. lFigures 9 through 12 illustrate the cooperative relationship betweenthe manual subassembly depicted in Figures 6, 7 and 8, and thosecomponents operatively connected with the secondary valve mechanismshown in Figure 4, whereby one may obtain a desired range of rotation ofthe motor shaft and the vane. f

The complete organization incorporating the parts of the presentapplication is fully disclosed in said parent case Serial No. 100,445.For brevity certain ancillary parts of the complete apparatus are onlytouched upon here, and reference should be made to the parent ycase forfull details.

The motor structure exemplified includes, among other things, a housing1, a mounting frame 3 permanently secured to the housing, a valve body 4detachably secured tothe motor cover, a primary or throttle valve 5carried by the valve body, mechanism or valving device 6 shown in Figure3 actuated'bya driving shaft 7 for controlling a secondary valve 8.

Valve 5 is to be turned on or ott to control op eration and speed of themotor. In the present instance this is done by artlexible manuallycontrolled cable device 143 connected to tab 117 of the valve. The upperpart of the valve block is provided with a circular recess 26, as shownin Figure 1, which rotatably receives the throttle or primary valve 5above referred to. As will be pointed out hereinafter, the valve blockis provided with a plurality of passages which communicate with therecess 26 and the chamber or raceway and the secondary valve 8.

The mounting plate 38 and mechanism 6 are preferably associated togetherto constitute a subassembly which may be readily detachably connected tothe motor'block. As illustrated in Figure 1, the valve block ispreferably re` cessed at 55; The cover and frame are also provided withrecesses toreceive theupp'er extremity of the mounting 'plate 38. Withthis arrangement, ythe subassembly is firmly interlocked with the valveblock. This is important from the standpoint of maintaining the hole 37and apertures 47 and 50 in the mounting plate in registry with themaching passageways in the valve blocks 35, 45 and 48, respectively.

The mounting plate is provided with an aperture which receives theshaftbearing 1 7, as shown in Figure 1. As illustrated in Figure 3,pivots 56 extend transversely through the mounting plate 38 andpivotally support a pair of corresponding 'rocker arms 57 and 58 formaintaining a cam member or kicker 59, rotatable on the shaft7, inpredetermined rotative positions in order that the uid intendedto'circulate through certain of the passages will not b e interruptedexcept at predetermined This cam member Amay be constructed as desired.,but, as depicted in Figure 4, it is preferably made; by stamping sameout of sheet metal stock to provide a notch forming a pairof spacedapart substantially parallel abutmets 62 and 63 adjacent one side ofthemember, andan interruption adjacent its opposite side to form a pair ofspaced marginal edges 64 and 65. The inner face of member 59 islprovided with rearwardly extending walls to form generally V-shapedcams 66 and 67. If; found desirable, thesecams may be constructedthetorm of pins. The upperends oftherocker arms 57 and 58 arecontinuously yieldably urged into engagement with the cams 66 and 67 bya helical expansible spring 68 carried by lugs 69 on the lower ends ofthe arms. The upper end of the rocker arm 57 is provided with a notch70, a rounded abutment 71, and an abutment 72 adjacent the pivot 56. Therocker arm 58 is similarly provided with a notch 73 and abutrnents 74and 75.

An elongated oscillating member 76, carrying the secondary valve 8, isalso rotatably mounted on the motor drive shaft 7 (see Figures 4 and 1respectively). This oscillating member is provided with an upper headportion having a slot 77 therein which loosely receives the valve 8. Thebody of the valve is of hollow construction and includes a flange 78which istdisposed between the oscillating member and the front face ofthe mounting plate in order to prevent escape of the valve. This valveis operable to alternately place the hole 37 in the mounting plate incommunication with first one and then the other of the apertures leadingto opposite sides of vane 12.

The oscillating member is provided with notches 79 and 80 adjacent thehead portion and its other extremity or tail portion 81 is provided witha rubber bumper 82 in the form of a sleeve surrounding the tail. Thetail is preferably notched as shown so that portions of the sleeve ortube will recede into the notches to automatically lock the tube inplace. The upper marginal ends of the cams 66 and 67 are adapted toperiodically engage the notches 79 and 80 to ilip the oscillatingmember. If found desirable, the construction may be modified so that thelower marginal ends of the cams will periodically engage the tail 81 atthe same time that the upper ends of the cams engage the notches 79 and80, or the lower ends may act to flip the oscillating member in lieu ofthe upper ends. The oscillating member is also provided with a centraltubular portion 83 which preferably engages the end of shaft bearing 17to maintain the member in predetermined spaced operative relationship tothe parts to be engaged thereby. It will be noted that the tubularportion 83 rides on the larger cylindrical portion of the shaft 7whereas the cam member 59 rides on a reduced cylindrical portion 84 andengages the shoulder 85 between such cylindrical portions forpredetermining the position of the cam member.

The adjustable means on the motor whereby any required rotational rangeor movement ofthe motor shaft and vane or piston may be obtained isunique in character and will now be described. A round guide plate 86,as shown in Figure 4, rotates with the shaft 7 by reason of an oblongcenter opening 87 in the plate which receives the reduced oblong end 88of the shaft. The periphery o f this plate is preferably interrupted bya pair of diametrrcally opposed corresponding slots 89 which arearranged 1n alignment with the oblong opening 87. A resilient metalwasher 90 may be mounted on the shaft between the rearn member 59 andthe guide plate 86 in order to assistA in .reducing frictiontherebetween. An axial hole 91 is provided in the end of the shaft 7 andreceives th shank of a headed pin 92.

. A driver 93 preferably made inthe form of a plate is provided with acentral straight slot 94 which receives the pin 92. YThis driver is alsoprovided with a pair of rearwardly extending diametrically opposedfingers 95 and 96 adjacent its periphery which are of a suiiicientlength to project through the slots 89 in the guide plate 86,- and withfinger 95 between the abutments 62 and 63 on the cam member 59 andfinger 96 between the spaced marginal edges 64 and 65 adjacent the loweredge or side of such cam member. A small metal spring washer 97 ispreferably mounted on the shank of the pin 92 and bears against theouter surface of driver 93 and the underside of the head of the pin 92in order to assist in pressing the driver rearwardly and maintain thevariousv parts of'the actuating mechanism in proper assembly. The shankof the pin 92`i s detachably held in the axial 4 hole 91 of the shaft bya cover or shield 98, as shown in Figure 1, so that removal of the coverwill permit disassembly of the actuating mechanism carried by the shaft7. The driver is further provided with a curved slot 99 defined by anupper marginal arcuate edge 100 of a predetermined radius and a lowerarcuate marginal edge 101 of a different radius and the ends of thecurved slot terminate in abutments 102.

Movement of the driver 93 to obtain a desired range of rotationalmovement of the motor shaft is shown controlled by manually rotating aknob 203 carried by the cover 98, as shown in Figure 1. This knob isattached to the cover by a rivet 202 which extends through the knob andcover and also through a driver or eccentric 103 anchored for rotationwith the knob. As shown 1n Figures 5 to 7 the eccentric, including anactuating element 104 and a resilient washer 105, are interposed betweenthe front wall of the cover and the front wall of the knob. It will benoted that the washer bears against the knob and the actuating elementfor the purpose of obtaining suicient friction to maintain the parts inposition after they have been adjusted. The actuating element isprovided with a circular aperture 106 which rotatably receives theeccentric and is further provided with a pair of `diametrically opposedrearwardly extending lugs 107 and 108. The longer lug 107 projectsthrough a vertical slot 109 in the cover and into the curved slot 99 ofthe driver 93 and the shorter lug 108 extends into a clearance 110, thelatter being diametrically opposed to the slot 109. With this uniquearrangement, the driver 93 is adapted for movement only in a planeparallel to the guide plate and transverse to the longitudinal axis ofthe motor shaft and the actuating element is limited to a generallyvertical and swinging movement v motor shaft.

parallel to the cover and substantially transverse to the longitudinalaxis of the rivet 202. The knob may be provided with an arrow or mark111 and the cover with a dial 112 indicating various degrees of rotationfor the The actions resulting from adjusting the control knob 203 tovarious positions will be described more in detail subsequently.

The shield 98 covers the valve operating mechanism 6 and includes aborder flange 113 which is adapted to bear against mounting plate 38 anda lower inturned finger 114 which extends under and rearwardly of theplate. Screws 11S received in the outer internal threaded ends of screws54 serve to detachably secure the shield 98 in place. The front wall ofthe shield as stated above, is adapted to be engaged by the headed pin92 to retain partsof the secondary valve operating mechanism in properassembly.

As clearly illustrated in Figure l, means are provided for filtering airwhich is introduced through the apertures 47 and 50 provided in themounting plate 38 leading to the interior of the housing. The cover 98is adapted .to bear relatively tight against the outer face of themounting plate to provide a substantially fluid-tight construction sothat any air that is admitted into the housing or raceway through theapertures in the mounting plate will have to pass 'through the filter.The filtering means includes a receptacle 133 having a bottom and endwalls and a back wall 138. The end walls are provided with upwardlyextending continuations. The end walls and the continuations are adaptedto embrace the side edges of the mounting plate and the upper transversemarginal edge 138 of the back wall may engage the frame 3, as shown inFigure l.

The annular recess 128, formed in the underside of the throttle valve 5,is at all times in communication with the vacuum means. When thethrottle valve is in olf position, the motor shaft will be held againstmovement to operate a wiper arm and blade, this being due to the factthat the recess 128 is not connected with the port in the motor blockleading to the hole 37 in the mounting plate through passage 3.5. Whenvalve'S `is the on" gaat pssitiol the vacuum line win be valved rst toone side and `then the other of` vane 12 by the action of the snap valvemechanism described, to oscillate vane 12 so long as the valve is in theon position. j

As briefly described above, the driver 93 movable with the shaft 7serves to oscillate the cam member 59 lrelaf tive to the shaft and whenthe cam member reaches a predetermined position, the spring 68 undercompression will cause the rocker arms to snap the cam member againstthe oscillating member 76 which carries the secondary valve 8. Moreparticularly, the guide plate 86 is keyed to the shaft 7 and the driver93 to the plate by -rneans `of the fingers 95 and 96 extending throughthe slots 89. Since ,the driver moves with the shaft the finger 95 onthe driver will alternately engage the spaced abutments 62 and 63 on thecam member. Assuming that the oscillating member 76 has beenA flipped toplace the secondary valve in position to cause the vane to be pulledtoward the left, the ycams 66 `and 67yon member 59 will be located in aposition just the reverse ofFigure 3. As the shaft 7, guide plate 86,driver 93 and vane 12 rotate clockwise, the oscillating member 76 andcam member 59 will remain stationary until the upper finger or lug 95 onthe driver 93 engages the abutment 63 on the cam member, whereupon thecam member is rotated along with the driver causing the cam 66 to moveout of the notch 70 in the rocker arm 57 and cam 67 to act againstabutment 74 on arm 58. This movement of the cam member 59 causes theupper extremities ofthe rocker arms to spread apart or diverge andcompress the spring 68 as viewed in Figure 3, and the instant the camsr1de over the abutments 71 and 74 and beyond center, the arms will snapthe cam 66 `on member 59 against the notch 79 on the oscillating member76 to cause the latter to ip over so that the secondary valve 8 willcover hole 37 and aperture 50, after which the vacuum will cause thevane to be moved lback to the right in a counterclockwise direction.When the hole 37 and aperture 50 are so covered, the cam 67 will beseated in notch 73 ofrocker arm 5S and cam 66 against the abutment 71 onarm 57 and rubber bumper 82 against abutment 72 on arm 57. As the shaft'7, driver 93, guide plate 86 and vane 12 travel in thecounter-clockwise direction just stated, the oscillating member 76 andcam member 59 will remain. stationaryuntil'the finger .9,5 Aon thedriver engages the abutment 62 on member 59 whereupon the member isrotated along with the driver causing the cams 66 and 67 to urge theupper extremities of the rocker arms 57 and 58 outwardly to compress thespring 68 and the instant the cam member 59 is moved past center, itwill 'be thrown to snap cam 67 against the notch 80 of the oscillatingmemberl76 to ip the latter back to a position where secondary valve 8will again cover hole 37 and aperture 47.

lf found desirable, the parts could be so designed and constructed thatthe lower nger 96 on the driver would engage the lower marginal edge 64on the cam member at the same time that linger 95 engages abutment 63and the same applies with respect to the marginal edge 65 and abutment62, or the arrangement may be such that the lower finger 96 willalternately engage the edges 64 and 65 in lieu of the finger 95 engagingabutments 62 and 63.

It is to be noted that the points of engagement between the finger 95 onthe driver and the abutments 62 and 63 on the cam member are adjacent tothe base of the notch which forms the abutments 62 and 63 and are relatively close to the axis of the shaft 7.

As stated above, one of the important objects of the invention is toprovide a unique arrangement whereby the range of rotational movement ofthe shaft and vane may be varied, within practicable limits, to meetdifferent installation requirements. Thus, lone motor equipped with themanual control of the subject invention exemplified may be installed inany one of a considera-ble number of different types, makes or models ofautomotive vehicles.

with. such a' motor, `the replacement setup yis improved s described at,the 1beginning of this specification. manual control is operableindependently of the control of tab 117 and as pointed out above ispreferably pril marily carried by the cover 98 shielding the secondaryvalve actuating mechanism.

This manual control may be operated by merely mae nipulating the knob203. When, for example, a particular installation requires that themotor shaft oscillate within the maximum range of 120 degrees, the knobwill be located so that the arrow 111 thereon will register with the 120degree mark on the cover as illustrated in Figure 6, in which positionthe upper finger 9S on the driver will be located as shown invFigu`res9r and 11 and the upper lug 107 on the actuating element 104will be arranged adjacent to thelower marginal arcuate edge 101 of thecurved slot 99 in the driver. If, for example, the installation requiresthe minimum range of 8O degrees, the knob will be turned to placetherarrow opposite the degree mark as illustrated in Figures 8, 10and12, in which position the finger on the driver 9,3 will be located agreater radial distance from the axis of the shaft 7 and consequently,such finger will alternately en-v gage the outer extremitiesl of theabutments 62 and 63 to cause the driver, guide plate land vane to travela shorter rotational distance than when the control is set for a maximumrange. This difference in rotational ranges is dueto the fact that thedriver is adjustable with respect to the cam member so that the linger95 may, within practicable limits, bemoved to anyone of a number ofinfinite radial distances from the shaft axis to obtain a rotationalrange within 80 to 120 degrees as illustrated. It will be noted that thefaces Iof the abutments 62 and 63 are arranged at an angle withreference to a line passing through the fingers 95 and 96 on the deviceso that the upper linger 95 will travel a shorter circumferentialdistance to engage the abutments when located farther away from theshaft axis as shown in Figurer l0 than when closer as depicted in Figure9. Obviously, the

components employed to obtain the rotational ranges just referred t-omay be modified to obtain a range less than 80 degrees or in excess of120 degrees. n

When the installation requires that the motor should function to rotateits shaft and a wiper armiv operatively .connected lthereto within arange l'ess than the maximum, the knob will be rotated so that the upperlug 107 on the` actuating element 104 will forcibly engage the uppermarginal edge of the curved slot 99 provided in the driver 93 to movethe finger 95 on the driver outwardly whereby the finger may alternatelyengage thev abutments 62 and 63 on the cam member. The linger 95 may bepulled back to obtain the maximum rotational movement of the shaft, bymanipulating the knob so that the lug 107 will be drawn against thelower marginal edge 101 of slot 99. The straight marginal edge of theopening in the cover 98 provides a stop for the lowerlug 108 of theactuating element 104 but it is to be understood that other meanssuitable for the purpose may be employed to limit movement of theactuating element when operated by the eccentric 103. The opening 110also provides clearance for the lug 108 in order that the actuatingelement may be pivoted by the eccentric 103 and at the same time sliderelative to the cover 98. As pointed out above, the upper and lowermarginal edges 100 and 101 of the curved slot 99 are of different radialdimensions and as a consequence, the marginal edges are located closertogether at a point substantially in alignment with the fingers 95 and96 and straight slot 94. Accordingly, the space between the marginaledges at such point is of a size to accommodate the upper lug 107 of theactuating element in order to hold the cam member and actuating elementassembled to obtain proper mechanical adjustment and movementtherebetween. This manual control assembly has proven satisfactory inuse and provides means whereby the rotational range namens of movementof the ,vane may be readily varied before or while thernotor is inoperation although in the majority of installations the control will beset for a predetenl mined range prior to installation. This manualcontrol` is entirely independently operable of the control unit 9.,

It will be noted that as wear, stretch or other abnor-A mal conditionsin the transmission mechanism between the vmotor and the windshieldwiper blade develop so as, lto create slap permitting the Wiper arm and/or blade to slap the windshield wiper frame'objectionably when the wiperis in operation, this control may be adjusted to shorten the rotationalarc of the wiper blade to prevent such slap. This is a rather prevalentcondition aiecting certain original typesr of installation.

Having thus described my invention, it is obvious that variousmodifications may be made in the same with out departing from the spiritof the invention, and, therefore, I do not Wish to be understood aslimiting myself to the exact forms, constructions, arrangements, andcombinations of parts herein shown and described and. .dened in theclaims.

I claim:

1. A control for use with a wiper motor comprising a cover provided witha pair of aligned openings, an actuat ing member engaging one side ofthe cover and having a pair of projections extending into the openings,an eccentric member engaging the actuating member, a knob membersurrounding the eccentric member, a driver arranged on the other side ofthe cover opposite the projections, means for maintaining the membersassembled with the cover whereby manipulation of the knob will cause theeccentric to move the actuating member so that its projections willoperate the driver, and friction means for holding the knob in placeafter adjustment.

2. A control for use with a wiper motor comprising a support providedwith an oblong opening, means for attaching the support to the motor, anactuating part on one side of the support and provided with a roundopening, a movable member disposed in the round opening, a knob membercarrying said movable member, a driver part arranged on the other sideof the support, means extending from one of said parts through` theoblong opening vcooperating with the other part, means for maintainingthe members and parts assembled with the support whereby manipulation ofthe knob member will cause the movable member to move the actuating partso that the extending means will slide in the oblong opening and operatethe driver part, and friction means for holding the knob in place afteradjustment.

3. A control for use with a vacuum operated windshield wiper motorhaving a cover tted over its valve snapping mechanism, comprising anactuating member slidably engaging the outer `face of said cover andhaving at least one projection extending through an elongated slotformed in said cover, an ecentric member engaging the actuating member,a knob member rigid with and surrounding the eccentric member, meansincluding a friction device for maintaining the members assembled -withthe outer face of the cover so that rotatonof theknob will cause theeccentric to shift said actuating member alongV said slot, a driverarranged Within the cover and having an arcuate slot formed therein inwhich said projection is to engage.

4. Means foi-'shifting the adjusting means of a vacuumoperated'windshield wiper motor having an oscillatory vane operatedshaft, controlled by snap action valve means, which valve is snaped by acam or kicker element actuated through a variable amplitude element,said valve elements being shielded by a cup-shaped cover tted to themotor body, comprising an actuating member engag'- ing the outer wall ofsaid cover and having a part projecting through an elongated slot insaid cover, an eccentric member disposed exteriorly of the cover andengaging the actuating member, a knob connected to the eccentric, meansmaintaining said members assembled to the cover whereby manipulation ofthe knob will cause the eccentric to shift the actuating member, adriver member arranged within the cover and having an arcuate slotformed therein in which the projection of said actuating member isreceived, a guide plate having a central aperture mounting it againstrotation on the motor shaft, said guide plate being formed with slotsaligned with said central aperture, said driver member having lugsextending through said slots in the guide plate and one of said lugsengageable With said cam member of the valve mechanism, and comprisingsaid variable amplitude element.

5. A mechanical system for shifting the position of the variableamplitude element controlling the snap valve mechanism of a vacuum wipermotor, comprising a cover for fitting against the motor and enclosingsaid val've mechanism, a cupped knob having its edge disposed con-ytiguous the outer wall of said cover, there being an elongated slot insaid cover, anactuating member enclosed between said knob and cover andhaving a projection extending through said slot for engagement in a slotformed in said amplitude element, means also enclosed by said knob forconverting rotation of said knob into movement of said member along saidslot, and means including a friction device between the knob and actuating member for holding the members to the cover as a unit and againstdisplacement by vehicle jarring.

References Cited in the le of this patent UNITED STATES PATENTS1,509,472 Carey Sept. 23, 1924 1,639,885 Gammeter Aug. 23, 19272,590,475 Staltenberg Mar. 25, 1952 2,696,805 Krohm Dec. 14, 19542,697,419 Krohm Dec. 21, 1954 2,704,331 Stott et al. Mar. 15, 19552,771,784 Diehel Nov. 27, 1956 FOREIGN PATENTS 535,687 France Ian. 30,1922 UNTTED STATES PATENT OFFTCE CERTIFICATE OF 'CORRECTION Patent No.2,877,659 Merch 17, 1959 Fred Aa Krohm It is hereby certified that errorappears in theprinted specification of the above numbered patentrequiring correction and that the said Letters Patent should read ascorrected below.

Column 2, lines 50 end 5l, ,strike out "meaning passageways in thevalve* blocks 35, t5 and A8, respective-1L" ,and insert instead matchingpassageways in the Valve block.

Signed and sealed this 3rd day of May 1960,

(SEAL) Attest:

KARL H. AXLTNE Attesting Gflcer ROBERT C. WATSON Commissioner of Patents

